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Alcohols, Phenols and Ethers

AIPMT 2003MCQMedium📈 Topic in 25% papers+4−1
Ques. 1AIPMT 2003

In a set of the given reactions, acetic acid yielded a product C. CH3COOH + PCl5 A [Anh. AlCl3]C6H6 B [ether]C2H5MgBr C Product C would be

  1. CH3CH(OH)C2H5
  2. CH3COC6H5
  3. CH3CH(OH)C6H5
  4. CH3- C2H5 |C(OH)C6H5

Answer

(4) CH3- C2H5 |C(OH)C6H5

Solution

CH3COOH + PCl5 CH3COCl (A) + POCl3 + HCl

Friedel–Crafts acylation: CH3COCl + C6H6 Anh. AlCl3 CH3COC6H5 (B) + HCl

Grignard addition to the ketone, then hydrolysis of the adduct, gives a 3° alcohol:

CH3COC6H5 C2H5MgBr CH3C(C2H5)(OMgBr)C6H5

H2O CH3C(C2H5)(OH)C6H5 (C)

C is 2-phenylbutan-2-ol.

Answer: (4)

Keep practising — Alcohols, Phenols and Ethers

Ques. 2AIPMT 2002

n-Propyl alcohol and isopropyl alcohol can be chemically distinguished by which reagent?

  1. PCl5
  2. reduction
  3. oxidation with potassium dichromate
  4. ozonolysis
Ques. 3AIPMT 2002

When phenol is treated with CHCl3 and NaOH, the product formed is

  1. benzaldehyde
  2. salicylaldehyde
  3. salicylic acid
  4. benzoic acid
Ques. 4AIPMT 2001

In preparation of alkene from alcohol using Al2O3 which is the effective factor ?

  1. Porosity of Al2O3
  2. Temperature
  3. Concentration
  4. Surface area of Al2O3
Ques. 5AIPMT 2001

Which of the following is correct?

  1. On reduction, any aldehyde gives secondary alcohol.
  2. Reaction of vegetable oil with H2SO4 gives glycerine
  3. Alcoholic iodine with NaOH gives iodoform.
  4. Sucrose on reaction with NaCl gives invert sugar.
Ques. 6AIPMT 2000

Which reagent converts propene to 1-propanol ?

  1. H2O, H2SO4
  2. B2H6, H2O2, OH-
  3. Hg(OAc)2, NaBH4/H2O
  4. Aq. KOH

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